Self-sealing coke oven door



May 28, 1968 w. STANKE SELF-SEALING COKE QVEN DOOR Filed Aug. 14, 1964 4 l ll INVENTOR. WAL TEE STANKE fil's United States Patent 3,385,771 SELF-SEALING COKE OVEN DOOR Walter Stanke, Essen, Germany, assignor, by mesne assignments, to Koppers Company, Inc., Pittsburgh, Pa., a corporation of Delaware Filed Aug. 14, 1964, Ser. No. 389,662 4 Claims. (Cl. 202248) ABSTRACT OF THE DISCLOSURE The sealing bar of a coke oven door has a knife edge that engages a sealing surface on the door frame and has a sloping surface matching and coacting with the head of a bolt having a shank projecting through the sealing bar and door. The through bolt has an elongate slot in it which receives a wedge that coacts with the door and bolt to secure the sealing bar in position relative to the door.

This invention relates to a self sealing coke oven door, having a door body which is connected by means of a friction seal to a horizontally movable, sealing bar which extends outwardly from said door body and which encompasses the door body portion.

In known self-sealing coke oven doors, the sealing bar, which encompasses the body of the door, is movable on a sealing matching surface of the door body against the sealing surface of the door frame of the oven chamber, and consists of a flat steel section of constant thickness with a pointed sealing edge that is held in friction seal against the matching surface of the door body by means of bolts.

The doors and the frames of the oven chamber are subjected to warping as a result of the high heat effect of the oven chamber. This warping must be compensated by the sealing bar to maintain a satisfactory seal on the sealing surface of the door frame of the oven chamber. This adjustment is effected, on known coke oven doors, by hammering against the bar at the places where the bar is not tightly fitted against the door frame of the oven chamber.

In the case of an impact each time the door is installed against the door frame of the oven chamber, with a substantial back pressure in the vicinity of the sealing bar which is sagged or bent against the frame of the oven chamber, the sealing bar, in time, is pushed back on the matching surface of the body of the door so that frequent resealing by hammering against the sealing bar is necessary. When the sealing bar has been adjusted to the varying warping, caused by expansion after the maxi mum temperature of the oven chamber has been reached, generally there is scarcely any significant warping, which could make the tightness questionable.

The object of the invention, therefore, is to improve the known coke oven door in such a way that, even in the case of hard impacts of the sealing bar against the frame of the oven chamber during installation of the door, receding of the sealing bar, relative to the matching surface, is practically impossible.

This object is accomplished, according to the invention, by the fact that the outer surface of the sealing frame is provided with a linear bevel along the sealing knife edge and the head of the pressing means, effecting the friction seal, coacts in a self-locking manner with a correspondingly matching inclined surface.

The sealing bar is thus completely secured against a recurrent shifting of the sealing bar, since the backward forces act against a wedge. A readjustment of the sealing bar by hammering is possible at any time. Only an adjustment of the tension of the pressing means is then required.

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A further object of the invention is to tighten the gripping means, which effects the friction seal with the body of the door, by means of wedges. Such tightening is produced considerably more easily and more rapidly. Not only does it make possible any necessary adjustment of the tension without loosening the bolts, but also the sealing bar is easily and rapidly adjusted.

The invention is illustrated in the drawing, showing a coke oven door constructed in accordance with the present invention in a horizontal partial section.

The metallic door body is indicated by 1. A metallic holding frame 2 for the refractory door plug 3 is connected with the body 1 of the door. The opening of the oven chamber 4 is surrounded by a metallic frame 5, which has a fiat sealing surface 6.

In the closed position of the door, a sealing bar 7, having a knife edge 8, fits against the sealing surface 6 of the door frame 5. The sealing bar 7 comprises an encompassing, endless frame, the cross section of which is reinforced on the outside along the sealing knife-edge 8 with a sloping surface 9. A matching surface 10 of the sealing bar 7 is tightly fitted against a similar surface of the door body 1 with interposition of a soft packing 11. The sealing bar 7 preferably consists of a sectional shape, on which only the necessary bevel for the sealing knife edge has to be made.

The sealing bar 7 is pressed against the matching sloping surface of the body of the door by means of a bolt 13, which passes through the body of the door and the sealing bar via an elongated slot 12. The bracing is effected by means of a self-locking key or wedge 14, which passes through the bolt. The head 15 is preferably constructed rectangularly and is adapted to the bearing surface 16 of the sloping surface of the sealing bar 7.

After final expansion, the sealing bar 7 is fitted to the sealing surface 6 of the frame 5 of the oven chamber by hammering against the outer end 17 of the sealing bar, whereupon the wedge 14 is drawn firmly in the bolt, so that a recurrent shifting of the Sealing bar 7 can no longer take place.

The concept of the invention is practiceable in similar manner with a bolt, which passes through the body of the door outside the sealing bar and which braces the sealing bar by means of a hooked attachment.

I claim:

1. A coke oven door comprising:

(a) a door body having a portion with a friction sealing peripheral surface extending substantially perpendicular to the plane of said door said portion having therein a hole;

(b) a bar encompassing the periphery of said door body portion and having a matching planar surface engaging the peripheral planar surface of said door body portion and having opposite first and second intersecting planar surfaces that converge towards said matching planar surface with the first planar surface forming with said matching planar surface a knife-like edge said bar having therein a hole in registry with the hole in said door body;

(c) a bolt having a head portion with a sloping surface engaging and matching said second planar surface, and having a shank portion with a slot therein, said bolt shank extending through said registering holes; and

(d) means for maintaining said bolt in selected positions relative to said door body whereby said bar is fixed relative to said body portion.

2. The invention set forth in claim 1 wherein:

(a) said means includes a wedge disposed in the slot in said bolt that coacts with said bolt and said door body portion.

3. The structure of claim 1 including:

(a) packing disposed between the coacting matching planar surface of said bar and the peripheral planar surface of the door body to form a seal between such surfaces.

4. In a coke oven having a door frame and a door adapted to fit said frame,

(a) a sealing bar encompassing the door and having a knife edge to bear against the frame;

(b) a bolt having a head engaging said sealing bar and a shank extending through holes in said bar and door, the shank of said bolt having an aperture therein; and

(c) a wedge disposed in said aperture and coacting with the bolt and said door for holding said door, said bolt, and said knife edge as a unit whereby the knife edge sealingly fits against the surface of the. door frame.

References Cited UNITED STATES PATENTS MORRIS O. WOLK, Primary Examiner.

R. E. SERWIN, Assistant Examiner. 

